Second Thomas Shoal (English Wikipedia)

Robert C. Beckman; Ian Townsend-Gault; Clive Schofield; Tara Davenport; Leonardo Bernard (January 2013). Beyond Territorial Disputes in the South China Sea: Legal Frameworks. Edward Elgar Publishing. p. 19. ISBN 978-1-78195-594-9.

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Cohen, Michael. "Manila monitoring Chinese shoal moves". IHS Jane's Defence Weekly. Retrieved March 21, 2014.

https://www.manilatimes.net/2023/08/14/opinion/columns/ph-did-promise-to-remove-brp-sierra-madre-from-ayungin/1905253 PRESIDENT Joseph Estrada did promise in 1999 to remove the BRP Sierra Madre, which his Navy deliberately grounded on Ayungin (Second Thomas Shoal). In the instances when the governments of Estrada and later of President Benigno Aquino 3rd were reminded of that commitment by the Chinese, they claimed that technical difficulties prevented them from removing the landing ship, tank (LST) Sierra Madre.

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"Award" (PDF). Permanent Court of Arbitration. July 12, 2016. Archived from the original (PDF) on January 29, 2019. Retrieved July 17, 2016. p.174

https://pco.gov.ph/news_releases/no-existing-agreement-to-remove-brp-sierra-madre-from-ayungin-shoal-pbbm/ “And let me go further, if there does exist such an agreement, I rescind that agreement now,” President Marcos said. PND

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Esmaquel, Paterno (March 18, 2014). "China digs up details vs PH on Ayungin". Rappler. Retrieved March 21, 2014.
Cabal, Kaye (September 4, 2023). "Chinese harassment in Ayungin will happen again". RAPPLER. Retrieved May 10, 2024.
Leon, Dwight de (April 10, 2024). "Marcos 'horrified' by Duterte's alleged gentleman's agreement with China on West PH Sea". RAPPLER. Retrieved May 10, 2024.

de Castro, Erik; Ng, Roli (March 31, 2014). "Philippine ship dodges China blockade to reach South China Sea outpost". www.reuters.com. Thomson Reuters. Retrieved April 1, 2014.
https://www.reuters.com/article/idUSKCN1AV0VS/ China has assured the Philippines it will not occupy new features or territory in the South China Sea, under a new "status quo" brokered by Manila as both sides try to strengthen their relations, the Philippine defence minister said.
"Philippines denies deal with China over disputed South China Sea shoal". April 26, 2024.

"Award" (PDF). Permanent Court of Arbitration. July 12, 2016. Archived from the original (PDF) on January 29, 2019. Retrieved July 17, 2016. p.174